What is typically the result of receptor up-regulation?
a. A hormone's signal is amplified.
b. The number of receptors decreases.
c. The sensitivity of a cell to a hormone decreases.
d. The number of genes that code for a receptor increases.
e. The concentration of hormone molecules in the blood increases
a
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What is the feature of horsetails that was useful before the existence of scouring pads?
a. rhizomes b. silica in the stems c. photosynthetic cells d. cones at the tips e. scale-like leaves
__________ are body parts that look alike in
different lineages but did not evolve in a common ancestor. Fill in the blank(s) with the appropriate word(s).
The process that normally exerts the greatest control
over the water balance of an individual is a. sweating. b. elimination in feces. c. kidney function. d. evaporation through the skin. e. respiratory loss.
Achondroplasia is a form of human dwarfism. If two individuals with achondroplasia have children with the following ratio, 2 dwarf to 1 wild type, what is the means of inheritance of this phenotype?
A) epistasis B) recessive lethal C) dominant lethal D) simple recessive E) simple dominance